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IS31FL3731-SALS2-TR
Public Made by Adomby adom
ISSI Integrated Silicon Solution LED Drivers, SSOP-28-208mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
Generated by kicad-footprint-generator · KiCad file format 20260206
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| README.md | 8d ago |
IS31FL3731-SALS2-TR
ISSI Integrated Silicon Solution · LED Drivers · SSOP-28-208mil
IS31FL3731-SALS2-TR from ISSI Integrated Silicon Solution, in a SSOP-28-208mil. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | CA9 | bidirectional | LED matrix A current output/input port for matrix row CA9 (C9-1 to C9-8). |
| 2 | VCC | power_in | Power supply, 2.7V to 5.5V operating range (absolute maximum -0.3V to +6V). |
| 3 | SDB | input | Shutdown control; pulling SDB low puts the chip into hardware shutdown, where all registers cannot be written or read. |
| 4 | INTB | output | Interrupt output, active low; it is pulled low when Auto Frame Play movie ends and returns high automatically if low for at least 7ms. |
| 5 | GND | power_in | Ground; the thermal pad is also connected to GND. |
| 6 | R_EXT | passive | External 20kΩ resistor sets the LED current per ILED = 64.7/REXT; the recommended minimum REXT is 18kΩ. |
| 7 | CB1 | bidirectional | LED matrix B current output/input port for matrix column CB1 (C1-9 to C1-16). |
| 8 | CB2 | bidirectional | LED matrix B current output/input port for matrix column CB2 (C2-9 to C2-16). |
| 9 | CB3 | bidirectional | LED matrix B current output/input port for matrix column CB3 (C3-9 to C3-16). |
| 10 | CB4 | bidirectional | LED matrix B current output/input port for matrix column CB4 (C4-9 to C4-16). |
| 11 | CB5 | bidirectional | LED matrix B current output/input port for matrix column CB5 (C5-9 to C5-16). |
| 12 | CB6 | bidirectional | LED matrix B current output/input port for matrix column CB6 (C6-9 to C6-16). |
| 13 | CB7 | bidirectional | LED matrix B current output/input port for matrix column CB7 (C7-9 to C7-16). |
| 14 | CB8 | bidirectional | LED matrix B current output/input port for matrix column CB8 (C8-9 to C8-16). |
| 15 | CB9 | bidirectional | LED matrix B current output/input port for matrix column CB9 (C9-9 to C9-16). |
| 16 | C_FILT | passive | Capacitor connection used for audio processing. |
| 17 | IN | input | Audio input used to modulate LED intensity or frame playing in audio modes. |
| 18 | AD | input | I2C address setting: tie to GND (AD=00), SCL (AD=01), SDA (AD=10), or VCC (AD=11). |
| 19 | SDA | bidirectional | I2C-compatible serial data line; open-collector bidirectional, typically used with a 4.7kΩ pull-up, up to 400kHz. |
| 20 | SCL | input | I2C-compatible serial clock input, uni-directional, maximum 400kHz. |
| 21 | CA1 | bidirectional | LED matrix A current output/input port for matrix row CA1 (C1-1 to C1-8). |
| 22 | CA2 | bidirectional | LED matrix A current output/input port for matrix row CA2 (C2-1 to C2-8). |
| 23 | CA3 | bidirectional | LED matrix A current output/input port for matrix row CA3 (C3-1 to C3-8). |
| 24 | CA4 | bidirectional | LED matrix A current output/input port for matrix row CA4 (C4-1 to C4-8). |
| 25 | CA5 | bidirectional | LED matrix A current output/input port for matrix row CA5 (C5-1 to C5-8). |
| 26 | CA6 | bidirectional | LED matrix A current output/input port for matrix row CA6 (C6-1 to C6-8). |
| 27 | CA7 | bidirectional | LED matrix A current output/input port for matrix row CA7 (C7-1 to C7-8). |
| 28 | CA8 | bidirectional | LED matrix A current output/input port for matrix row CA8 (C8-1 to C8-8). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | ISSI Integrated Silicon Solution |
| Package | SSOP-28-208mil |
| Category | LED Drivers |
| Pins | 28 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Supply voltage | VCC | 2.7 | 5.5 | V | 5 | ||
| Shutdown current | ISD | 0.5 | 5 | μA | VSDB = 0V | 5 | |
| Rise time of both SDA and SCL signals | tR | 300 | ns | receiving (Note 8) | 6 | ||
| Fall time of both SDA and SCL signals | tF | 300 | ns | receiving (Note 8) | 6 | ||
| Supply voltage (absolute maximum) | VCC | -0.3 | 6 | V | 5 | ||
| Voltage at any input pin (absolute maximum) | -0.3 | V | 5 | ||||
| Maximum junction temperature | TJMAX | 150 | °C | 5 | |||
| Storage temperature range | TSTG | -65 | 150 | °C | 5 | ||
| Operating temperature range | TA | -40 | 85 | °C | TA=TJ | 5 | |
| ESD (HBM) | -8 | 8 | kV | 5 | |||
| ESD (CDM) | -1 | 1 | kV | 5 | |||
| Recommended minimum external resistor | REXT | 18 | kΩ | 6 | |||
| Quiescent power supply current | ICC | 2.17 | mA | VIN = 0V, without audio input, all LEDs off | 5 | ||
| Shutdown current (software shutdown) | ISD | 230 | μA | VSDB = VCC, software shutdown | 5 | ||
| Output current of C1~C9 | IOUT | 34 | mA | Matrix display mode without audio modulation (Note 4) | 5 | ||
| Current sink headroom voltage C1~C9 | VHR | 400 | mV | ISink = 270mA (Note 5) | 5 | ||
| Current source headroom voltage C1~C9 | VHR | 400 | mV | ISource = 34mA | 5 | ||
| Period of scanning | tSCAN | 106 | µs | (Figure 2) | 5 | ||
| Non-overlap blanking time during scan | tSCANOL | 15 | µs | during scan (Figure 2) | 5 | ||
| Average current of each LED | ILED | 3.2 | mA | REXT = 20kΩ, PWM in 255 step (Note 6) | 5 | ||
| Logic 0 input voltage | VIL | 0.4 | V | VCC = 2.7V | 5 | ||
| Logic 1 input voltage | VIH | 1.4 | V | VCC = 5.5V | 5 | ||
| Logic 0 input current | IIL | 5 | nA | VINPUT = 0V (Note 7) | 5 | ||
| Logic 1 input current | IIH | 5 | nA | VINPUT = VCC (Note 7) | 5 | ||
| Serial-Clock frequency | fSCL | 400 | kHz | 6 | |||
| Bus free time between a STOP and a START condition | tBUF | 1.3 | μs | 6 | |||
| Hold time (repeated) START condition | tHD, STA | 0.6 | μs | 6 | |||
| Repeated START condition setup time | tSU, STA | 0.6 | μs | 6 | |||
| STOP condition setup time | tSU, STO | 0.6 | μs | 6 | |||
| Data hold time | tHD, DAT | 0.9 | μs | 6 | |||
| Data setup time | tSU, DAT | 100 | ns | 6 | |||
| SCL clock low period | tLOW | 1.3 | μs | 6 | |||
| SCL clock high period | tHIGH | 0.7 | μs | 6 | |||
| Thermal resistance, junction to ambient, still air (SSOP) | θJA | 72 | °C/W | still air | 5 | ||
| External resistor REXT (recommended value) | REXT | 20 | kΩ | 1 |
CAD (KiCad official)
- Symbol:
IS31FL3731-SALS2-TR - Footprint:
Package_SO:SSOP-28_5.3x10.2mm_P0.65mm - 3D model: SSOP-28-208mil (KiCad packages3D, STEP)
- 3D model files:
is31fl3731-sals2-tr-etched.step/is31fl3731-sals2-tr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);is31fl3731-sals2-tr.step/is31fl3731-sals2-tr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: ISSI Integrated Silicon Solution datasheet (24 pp, sha256
89698a6a5cb3908f, retrieved 2026-10-18, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-sonnet-5-5(agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish. - CAD: KiCad official libraries (CC-BY-SA 4.0).